/usr/share/perl5/Debian/Edu.pm is in debian-edu-config 1.818+deb8u2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 | package Debian::Edu;
use strict;
use Net::DNS;
use Net::LDAP;
use Term::ReadKey;
use vars qw(@ISA @EXPORT @EXPORT_OK);
require DynaLoader;
require Exporter;
@ISA = qw(Exporter DynaLoader);
@EXPORT = qw(find_ldap_server find_ldap_base
find_kerberos_server find_kerberos_realm);
@EXPORT_OK= qw(prompt4password);
# Convert hostname or IP address to the canonical DNS name, to make
# sure DNS CNAMEs etc can be compared.
sub canonize_hostname {
my $hostname = shift;
my ($name,$aliases,$addrtype,$length,@addrs) = gethostbyname($hostname);
return scalar gethostbyaddr($addrs[0], $addrtype);
}
# Take a list of host names and return the list of pingable hosts
# among these.
sub pingable_hosts {
return undef unless @_;
my $servers = join(" ", @_);
my $pingservers = `/usr/bin/fping -a $servers 2> /dev/null`;
return split(/\s+/, $pingservers);
}
sub parse_ldap_conf {
my $cfg = "/etc/ldap/ldap.conf";
if ( -r $cfg ) {
if (open(my $fh, "<", $cfg)) {
my $base;
my $host;
while (<$fh>) {
chomp;
$base = $1 if (m/^base\s+(\S+.*)\S*$/i);
$host = $1 if (m/^host\s+(\S+.*)\S*$/i);
$host = $1 if (m%^uri\s+ldap://([^/]+)%i);
}
return ($host, $base);
}
}
}
sub find_ldap_server {
my ($dnsdomain) = @_;
# Use the global settings from ldap.conf if they exist, to allow
# the settings to be changed from a central point.
my ($server, $base) = parse_ldap_conf();
return $server if $server;
# Prefer DNS entry named ldap
if (pingable_hosts("ldap")) {
return canonize_hostname("ldap");
}
my $res = Net::DNS::Resolver ->new;
$res->retrans(2); # default 5
$res->retry(2); # default 4
$res->tcp_timeout(5); # default 120
$res->udp_timeout(5); # default 120
my @nameservers = map { canonize_hostname($_) } $res->nameservers;
my $srv_query = $res->search("_ldap._tcp.$dnsdomain", "SRV");
if (!defined($srv_query)) {
return undef;
}
my @ldapservers;
for my $answer ($srv_query->answer) {
my $servername = canonize_hostname($answer->target);
push(@ldapservers, $servername);
}
# Prefer one of the current DNS servers used if it is in the list
# of LDAP servers, to ensure any DNS updates done using LDAP take
# effect imediately.
for my $nameserver (pingable_hosts(@nameservers)) {
for my $ldapserver (@ldapservers) {
if ($nameserver eq $ldapserver) {
return $nameserver;
}
}
}
return (pingable_hosts(@ldapservers))[0];
}
sub find_ldap_base {
my $ldapserver = shift;
# Use the global settings from ldap.conf if they exist, to allow
# the settings to be changed from a central point.
my ($server, $base) = parse_ldap_conf();
return $base if ($server eq $ldapserver && $base);
my $ldapref = Net::LDAP->new($ldapserver)
or die "Can't bind to ldap server $ldapserver: $!\n";
$ldapref->bind();
my $dse = $ldapref->root_dse();
my @contexts = $dse->get_value('namingContexts');
$base = undef;
if (1 > scalar @contexts) {
return undef;
} elsif (1 < scalar @contexts) {
# More than one context, try to look for defaultNamingContext,
# which is present on Active Directory.
if (my $defaultcontext = $dse->get_value('defaultNamingContext')) {
$base = $defaultcontext;
} else {
# Pick the first one with posixAccount or posixGroup
# objects in it.
for my $context (@contexts) {
my $mesg = $ldapref->search(
base => $context,
filter => '(|(objectClass=posixAccount)(objectClass=posixGroup))',
sizelimit => 1,
);
if (0 < $mesg->count()) {
$base = $context;
last;
}
}
}
} else {
$base = $contexts[0];
}
if (!$ldapref->unbind) {
print "error: unbinding from LDAP server\n";
}
return $base;
}
sub find_kerberos_realm {
my $dnsdomain = shift;
my $res = Net::DNS::Resolver->new;
$res->retrans(2); # default 5
$res->retry(2); # default 4
$res->tcp_timeout(5); # default 120
$res->udp_timeout(5); # default 120
my $srv_query = $res->search("_kerberos.$dnsdomain", "TXT");
if (defined($srv_query)) {
for my $answer ($srv_query->answer) {
return $answer->rdata();
}
}
return uc($dnsdomain);
}
sub find_kerberos_server {
my ($dnsdomain) = @_;
# Prefer DNS entry named kerberos
if (pingable_hosts("kerberos")) {
return canonize_hostname("kerberos");
}
my $res = Net::DNS::Resolver->new;
$res->retrans(2); # default 5
$res->retry(2); # default 4
$res->tcp_timeout(5); # default 120
$res->udp_timeout(5); # default 120
my @nameservers = map { canonize_hostname($_) } $res->nameservers;
my $srv_query = $res->search("_kerberos._tcp.$dnsdomain", "SRV");
if (!defined($srv_query)) {
return undef;
}
my @krbservers;
for my $answer ($srv_query->answer) {
my $servername = canonize_hostname($answer->target);
push(@krbservers, $servername);
}
# Prefer one of the current DNS servers used if it is in the list
# of Kerberos servers, to ensure any LDAP and Kerberos updates
# done take effect imediately.
for my $nameserver (pingable_hosts(@nameservers)) {
for my $krbserver (@krbservers) {
if ($nameserver eq $krbserver) {
return $nameserver;
}
}
}
return (pingable_hosts(@krbservers))[0];
}
# prompt function copied from http://www.perlmonks.org/?node_id=553981
sub prompt4password {
my ($prompt, %args) = @_;
local $| = 1;
my $phrase = '';
print $prompt;
ReadMode 'cbreak';
while (1) {
my $c = ReadKey ~0/2-1; #windows workaround http://rt.cpan.org/Public/Bug/Display.html?id=27944
if ($c =~ /[\r\n]/) {
print "\n";
last;
}
elsif ($c eq "\b" || ord $c == 127) {
next unless length $phrase;
chop $phrase;
next if !defined $args{-echo};
print map $_ x length $args{-echo}, "\b", " ", "\b";
}
elsif (ord $c) {
$phrase .= $c;
print $args{-echo} if defined $args{-echo};
}
}
ReadMode 'restore';
$phrase;
}
# Allow functins in module to over replaced by other packages and
# local modifications when needed.
eval "require Debian::Edu_Overlay";
if ($@ && $@ !~ qr{^Can't locate Debian/Edu_Overlay.pm}) {
die $@;
};
eval "require Debian::Edu_Vendor";
if ($@ && $@ !~ qr{^Can't locate Debian/Edu_Vendor.pm}) {
die $@;
};
eval "require Debian::Edu_Local";
if ($@ && $@ !~ qr{^Can't locate Debian/Edu_Local.pm}) {
die $@;
};
1;
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